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Right hand side mirror stopped working a month after a speaker upgrade and the dealer said it was due to thier fault. Honestly, they can't splice wires even if that was the case? Cost me over $400.00 for a new motor

A dealer isn't going to splice wires, as that is a jury-rigged way of fixing the problem; they are going to replace the entire length of wire, both from a safety standpoint and from a profitability standpoint.

Sounds like whoever installed your speakers put extra strain on the wires for the mirror, and it eventually stopped working. The dealer probably replaced the entire motor because they won't splice wires to make things work again.